NEUTRINOLESS DOUBLE BETA-DECAYS AND NUCLEAR MATRIX-ELEMENTS OF GE-76 AND SE-82

We have made the nuclear shell-model calculations of the 0nubetabeta d ecays in Ge-76 and Se-82 using a model-space approximation. Also we ta ke into account the influences of both nuclear short-range correlation and finite nucleon size on the calculations of the transition matrix elements. The limits of Majorana neutrino mass and mixing parameter of right-handed current have been deduced by fitting the experimental va lues of 0nubetabeta decay lifetimes of Ge-76 and Se-82.